A type of cyanometer. an instrument used to measure the blueness of the sky. The Linke-scale is simply a set of eight cards of different standardized shades of blue. They are evenly numbered 2 to 26. The odd numbers are used by the observer if he or she j ...

The correction applied to an instrument to account for the effect of temperature upon its response characteristics.

The difference between downward and upward (total) radiation; net flux of all radiation.

A mercury barometer of the fixed cistern type in which a moveable scale terminating in an ivory point is used to compensate for the variations in the height of the mercury in the cistern

A sudden brief increase in the speed of the wind, followed by a lull or slackening. Compare to peak gust.

A curve showing the variation of temperature with height in the free air. See lapse rate.

General term for any device that measures precipitation: principally a rain gauge or snow gauge.

A thermometer consisting of a clock mechanism the speed of which is a function of temperature.

Same as an upper air observation, but commonly used to refer to a single complete radiosonde observation.

An instrument used to reveal but not necessarily measure the presence of an electrical quantity. It is used to display the output of a sensing element after suitable amplification and modification. Sometimes called display.

That temperature at which, in a specified latitude, the reading of a particular barometer requires no temperature or latitude correction.

A conically shaped, copper rain gauge shield.

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

Wind with a speed between 28 and 33 knots (32 and 38 mph); Beaufort scale number 7.

The actual time during which physical events take place.

A technique for making winds aloft observations in which two theodolites located at either end of a baseline follow the ascent of a pilot balloon. Synchronous measurements of the elevation and azimuth angles of the balloon. taken at periodic intervals, pe ...

A photometer that measures the received intensity of a distance tight source.

Thermometer for measuring the temperature in the soil at different depths.

The unit of force in the centimeter-gram-second system of physical units, i.e. one gm cm per sec2, equal to 7.233 x 10-5 poundal.

Same as rain gauge.